hruodland wrote:Power management already off on card (see output of iwconfig in my first post).

The `iwconfig` output displays the kernel's power management strategy but the firmware on the wireless card also has a power saving option that can be toggled via a module option (as can the hardware encryption) — my ArchWiki link explains the method.

The ath9k driver, as well as most of the atheros cards usually work nicely with Linux. So I am also suspecting router settings here.

What kind of encryption are you using in the router. I did read that "Other devices connect ok", but still think there may be something that may be optimized there. For example, changing the encryption to pure WPA2-PSK (AES) instead of WPA/WPA2 mixed mode with TKIP (the mixed mode is usually default in most routers).